Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-17 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.76 (679.8) | 29.04 (737.5) | 2.27 (57.7) 8.5% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 84.08 (2135.65) | 91.22 (2316.92) | 7.14 (181.27) 8.5% |
| Sidewall Height inches (mm) | 4.88 (124) | 4.52 (114.75) | -0.36 (-9.25) -7.5% |
| Revolutions per mile (km) | 753.56 (468.24) | 694.6 (431.61) | -58.96 (-36.63) -7.8% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.7 mph (34.92 km/h) |
| 25 mph (40.23 km/h) | 27.12 mph (43.65 km/h) |
| 30 mph (48.28 km/h) | 32.55 mph (52.38 km/h) |
| 35 mph (56.33 km/h) | 37.97 mph (61.11 km/h) |
| 40 mph (64.37 km/h) | 43.4 mph (69.84 km/h) |
| 45 mph (72.42 km/h) | 48.82 mph (78.57 km/h) |
| 50 mph (80.47 km/h) | 54.24 mph (87.3 km/h) |
| 55 mph (88.51 km/h) | 59.67 mph (96.03 km/h) |
| 60 mph (96.56 km/h) | 65.09 mph (104.76 km/h) |
| 65 mph (104.61 km/h) | 70.52 mph (113.49 km/h) |
| 70 mph (112.65 km/h) | 75.94 mph (122.22 km/h) |
| 75 mph (120.7 km/h) | 81.37 mph (130.95 km/h) |
| 80 mph (128.75 km/h) | 86.79 mph (139.68 km/h) |
| 85 mph (136.79 km/h) | 92.21 mph (148.41 km/h) |
| 90 mph (144.84 km/h) | 97.64 mph (157.14 km/h) |
| 95 mph (152.89 km/h) | 103.06 mph (165.86 km/h) |
| 100 mph (160.93 km/h) | 108.49 mph (174.59 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
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